Immunogen sequence: QEAVIPGCHL HPFNVTVRSD RQGTCQGSHV AQACVGHCES SAFPSRYSVL VASGYRHNIT SVSQCCTISG LKKVKVQLQC VGSRREELEI FTARACQCDM CRLSRY; Positive Samples: Rat brain. GPHA2 is a cystine knot-forming polypeptide and a subunit of the dimeric glycoprotein h